问题
填空题
刘星将一块重2N的橡皮泥放入水中后橡皮泥立即沉入水底;他取出橡皮泥将其捏成船状再放入水中,“泥船”却漂浮在水面上,他是利用了______方法来增大浮力的,此时“泥船”所受的浮力为______N.
答案
橡皮泥捏成船状放入水中时,排开水的体积变大,由F浮=ρ水gv排知道,橡皮泥受到的浮力变大;
∵“泥船”漂浮,
∴“泥船”受到的浮力:
F浮=G=2N.
故答案为:增大排开液体的体积,2.
刘星将一块重2N的橡皮泥放入水中后橡皮泥立即沉入水底;他取出橡皮泥将其捏成船状再放入水中,“泥船”却漂浮在水面上,他是利用了______方法来增大浮力的,此时“泥船”所受的浮力为______N.
橡皮泥捏成船状放入水中时,排开水的体积变大,由F浮=ρ水gv排知道,橡皮泥受到的浮力变大;
∵“泥船”漂浮,
∴“泥船”受到的浮力:
F浮=G=2N.
故答案为:增大排开液体的体积,2.
选词填空。 从方框里选择正确的单词,并用其正确的形式填空。 | |
2. The stars came out as soon as______ fell. 3. We'll have an opportunity to ______views tomorrow. 4. The house itself is not ______ to my mind, but I like its environment. 5. They have two ______ in their house. 6. He hanged himself in______ after his wife died. 7. I say, waiter, the soup is too ______. 8.The _ decision came after weeks of deliberation. 9. Poetry always loses something in _______. 10. He was touched by the _______ of their welcome. |